US9211910B2 - KS lateral guidance system having a modified control characteristics when cornering - Google Patents
KS lateral guidance system having a modified control characteristics when cornering Download PDFInfo
- Publication number
- US9211910B2 US9211910B2 US12/084,355 US8435506A US9211910B2 US 9211910 B2 US9211910 B2 US 9211910B2 US 8435506 A US8435506 A US 8435506A US 9211910 B2 US9211910 B2 US 9211910B2
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- US
- United States
- Prior art keywords
- steering
- vehicle
- curve
- modified
- lane
- Prior art date
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- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000001133 acceleration Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D15/00—Steering not otherwise provided for
- B62D15/02—Steering position indicators ; Steering position determination; Steering aids
- B62D15/025—Active steering aids, e.g. helping the driver by actively influencing the steering system after environment evaluation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
- B60T2201/08—Lane monitoring; Lane Keeping Systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
- B60T2201/08—Lane monitoring; Lane Keeping Systems
- B60T2201/087—Lane monitoring; Lane Keeping Systems using active steering actuation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/10—Path keeping
- B60W30/12—Lane keeping
Definitions
- the present invention relates to a device for keeping a vehicle in its lane.
- LKS systems Lane Keeping Support
- the degree of automation in this connection ranges from systems, which by the application of artificial steering forces indicate to the driver how he would have to operate the steering in order to keep the vehicle in its lane, to LKS systems that guide the vehicle in its lane in a fully automated manner.
- LKS systems as in DE 101 14 470 A1, for example, include essentially a lane detection system such as e.g. a video system, using which the course of the lane ahead of the vehicle and the relative position of the vehicle (the amount of deviation and orientation) in the lane may be determined. If the path of motion of the vehicle deviates too much from a prescribed path of motion, then the system varies the support torque exerted on the steering and thereby produces artificial steering forces. These are so strong that the driver is able to detect them haptically, and they are directed in such a way that the driver changes the steering wheel angle in the direction of the setpoint path of motion. If the steering wheel angle is too small, then the driver senses, for example, an additional torque in the direction of the inside of the curve. If the steering wheel angle is too large, on the other hand, then he senses an additional torque in the direction of the outside of the curve.
- a lane detection system such as e.g. a video system, using which the course of the lane ahead of the
- FIG. 1 shows a steering system having an LKS functionality, which is capable of keeping a vehicle 8 in its lane 10 in a fully automated manner.
- the system as a whole includes a sensor system 7 situated on vehicle 8 for lane detection such as e.g. a video system, by which it is possible to ascertain the amount of deviation and the orientation of vehicle 8 with respect to its lane 10 (amount of lateral deviation, path deviation angle) as well as the course of the lane (curvature, change in curvature) in front of the vehicle.
- Lane detection system 7 here includes a video camera and a special image processing software, which ascertains the desired geometric data from the image data.
- the geometric data as well as additional driving state variables such as e.g. the driving speed are supplied to a mathematical reference model 13 , which calculates from this a reference steering angle ⁇ Ref .
- This reference steering angle ⁇ Ref is the steering angle that would have to be set in the steering system in order to keep vehicle 8 optimally in its lane 10 .
- This value ⁇ Ref flows into a downstream control loop 11 , which has the task of controlling the actual steering angle ⁇ to match the specified setpoint value ⁇ Ref and thus to keep vehicle 8 in its lane (normally in the middle of the lane).
- Elements 2 , 3 , 4 a and reference model 13 are normally implemented as software modules in a control unit 12 .
- Controller 3 has a P-behavior and is designed in such a way that a system deviation ⁇ may be controlled in a stable manner.
- Controller 3 here includes a characteristic curve, which produces a guide torque (signal M E ) as a function of the system deviation, which is supplied to steering control element 4 .
- Steering control element 4 which includes a controller 4 a and an actuator 4 b , converts the torque M E , depending on the control characteristics, into an actuating torque M A , which is then applied to the steering system.
- Actuating torque M A is superposed on torque M F applied by driver 1 on the steering wheel. This is represented by an additional adding node 5 .
- the transmission characteristic of the steering system is finally represented by a block 6 .
- FIG. 2 shows a driving situation in which vehicle 8 drives straight ahead in its lane 9 and in the process deviates from the center of the lane 16 .
- the LKS system in this case calculates a reference steering angle ⁇ Ref , which is to return vehicle 8 to the center of the lane 16 .
- the control system is at a point P of controller characteristic curve 14 shown on the right and produces a corresponding guide torque M E in the direction of the center of the lane 16 .
- LKS systems are usually designed in such a way that vehicle 8 is guided on a specified setpoint path of motion, normally the center of the lane.
- a disadvantage of these systems is the fact that many drivers tend to drive through curves, not in the center, but near the inside of the curve, thus cutting the corner.
- known LKS systems are fundamentally designed to guide a vehicle in the center of the lane, a deviation results, when cutting corners, between the steering angle desired by the driver and the reference steering angle, and thus a correcting steering intervention results on the part of the LKS system toward the center of the lane. This is shown schematically in FIG. 3 a .
- the guide torque applied by the LKS system in the direction of the center of the lane 16 is indicated by M E .
- An idea of the exemplary embodiment and/or exemplary method of the present invention is to modify the guiding behavior of the LKS system when cornering in such a way that, when cutting the corner, no or only very small artificial steering forces are applied to the steering system.
- the path of motion deviates in the direction of the outside of the curve, then steering forces continue to be applied which alert the driver to the departure from the lane or guide the vehicle automatically back to the setpoint path of motion.
- the LKS system distinguishes between a deviation in the direction of the inside of the curve and a deviation in the direction of the outside of the curve.
- the guiding behavior may thus also be called asymmetrical.
- an open-loop or closed-loop control characteristic curve is asymmetrically widened when cornering, a dead zone being produced in the process for the system deviation, in which no or a small guide torque is generated. That is to say that no or only small steering forces are applied to the steering system when cutting a corner as long as the system deviation is within the dead zone. If the system deviation, on the other hand, becomes greater than the dead zone (because the driver cuts the corner too sharply), then the LKS system again intervenes in a controlling manner. When the vehicle deviates in the direction of the outside of the curve, the control response may remain unchanged as when driving straight ahead.
- the size of the dead zone may depend on at least one additional driving state variable, in particular the driving speed and/or the yaw rate and/or the transverse acceleration and/or the course of the curve, and may be chosen to be of such a magnitude that the driver on the one hand has enough leeway to cut the corner and on the other hand is prevented from leaving the lane toward the interior of the curve.
- the control response of the LKS system may be already modified before the vehicle enters a curve.
- the size of the dead zone may grow steadily, reaches its maximum value at the apex of the curve, and falls again to the starting value when leaving the curve.
- the dead zone or the guiding behavior of the LKS control may not be modified abruptly.
- the characteristic curve may map the deviation of a state variable, such as e.g. a steering angle deviation, onto a guide variable, such as e.g. a steering torque.
- a state variable such as e.g. a steering angle deviation
- a guide variable such as e.g. a steering torque.
- the open-loop or closed-loop control characteristic curve may have a P-behavior and in particular not an I-behavior.
- the open-loop or closed-loop characteristic curve may be symmetrical (centrosymmetric) when driving straight ahead, and is modified into an asymmetrical characteristic curve when entering a curve.
- the reference steering angle ⁇ ref could alternatively be calculated differently when cornering, for example, or the system deviation could be modified.
- the functions may be stored as software in a control unit.
- FIG. 1 shows a schematic representation of an LKS system having a fully automatic guidance.
- FIG. 2 shows the guiding behavior of a known LKS system in the deviation of a vehicle from a setpoint path of motion.
- FIG. 3 a shows the guiding behavior of a known LKS system when cutting a corner.
- FIG. 3 b shows the guiding behavior of an LKS system according to the present invention when cutting a corner.
- FIG. 4 shows the characteristic of the magnitude of a dead zone when driving through a curve.
- FIGS. 1 , 2 and 3 a Reference is made to the introductory part of the specification regarding the explanation of FIGS. 1 , 2 and 3 a.
- FIG. 3 b shows the guiding behavior of an LKS system according to the present invention while cornering, in the process of which the driver cuts the corner.
- vehicle 8 is traveling outside of the center of the lane (corresponding in this case to the setpoint path of motion) too far in the interior of the curve. This results in a deviation between the steering angle chosen by the driver and the reference steering angle calculated by reference model 13 .
- no correcting steering intervention results in this case.
- controller characteristic curve 14 is widened asymmetrically and a dead zone 15 is created, in which no guide torque M E is produced in spite of a system deviation M. Within dead zone 15 , characteristic curve 14 and thus guide torque M E is equal to zero or assumes only very low values. This gives the driver sufficient leeway to cut the corner without the LKS system intervening in a regulating manner.
- the size of dead zone 15 may be a function of various driving state parameters, in particular the driving speed, the yaw rate, the transverse acceleration and/or the curve course of the roadway. It is chosen to be of such a size that the driver may indeed cut the corner, but continues to be prevented from leaving the lane in the direction of the interior of the curve.
- FIG. 4 shows the buildup and decline of dead zone 15 from entering a curve to exiting the curve over time t.
- the size of dead zone 15 already grows before entering the curve (time t 1 ) and reaches its maximum value at the apex of the curve (time t 2 ). The maximum value is maintained until vehicle 8 leaves the curve again (time t 3 ) and is then reduced continuously toward zero.
- characteristic curve 14 then in turn corresponds to the one from FIG. 2 .
- the modification according to the exemplary embodiment and/or exemplary method of the present invention of the guiding behavior when cornering may be implemented both in semiautomatic systems, which only provide steering indications to the driver, as described above, as well as in fully automatic systems.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
Abstract
Description
- 1 driver
- 2 adding node
- 3 controller
- 4 control element having a torque control loop
- 4 a controller of
control element 4 - 4 b actuator of
control element 4 - 5 adding node
- 6 steering system
- 7 lane detection system
- 8 vehicle
- 9 lateral marking
- 10 lane
- 11 control loop
- 12 control unit
- 13 reference model
- 14 characteristic curve
- 15 dead zone
- 16 center of the lane
Claims (11)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102005052034A DE102005052034A1 (en) | 2005-10-31 | 2005-10-31 | Lane keeping support system for motor vehicle, has steering controller, where steering characteristics of system is modified while cornering, such that smaller steering force is exerted on steering in direction of curve inner side |
DE102005052034 | 2005-10-31 | ||
DE1020050502034.0 | 2005-10-31 | ||
PCT/EP2006/066495 WO2007051671A1 (en) | 2005-10-31 | 2006-09-19 | Steering control low-maintenance system with a modified control characteristic when turning |
Publications (2)
Publication Number | Publication Date |
---|---|
US20100004821A1 US20100004821A1 (en) | 2010-01-07 |
US9211910B2 true US9211910B2 (en) | 2015-12-15 |
Family
ID=37607331
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/084,355 Active 2030-11-16 US9211910B2 (en) | 2005-10-31 | 2006-09-19 | KS lateral guidance system having a modified control characteristics when cornering |
Country Status (5)
Country | Link |
---|---|
US (1) | US9211910B2 (en) |
EP (1) | EP1945494B1 (en) |
JP (1) | JP4741676B2 (en) |
DE (2) | DE102005052034A1 (en) |
WO (1) | WO2007051671A1 (en) |
Families Citing this family (27)
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DE102007020280A1 (en) * | 2007-04-30 | 2008-11-06 | Robert Bosch Gmbh | Method and device for controlling a driver assistance system |
DE102007022184A1 (en) | 2007-05-11 | 2008-11-13 | Robert Bosch Gmbh | Driver assistance device and method for its control |
DE102007043910A1 (en) * | 2007-09-14 | 2009-03-26 | Robert Bosch Gmbh | Method for controlling a driver assistance system |
DE102007043913B4 (en) * | 2007-09-14 | 2020-10-29 | Robert Bosch Gmbh | Method for controlling a driver assistance system |
DE102008001105A1 (en) * | 2008-04-10 | 2009-10-15 | Zf Lenksysteme Gmbh | Steering torque automatically influencing method for motor vehicle steering system, involves providing counter steering torque with minimum value in target track's region and progressively stepping up torque with increased distance to track |
DE102008057313B4 (en) | 2008-04-24 | 2018-03-01 | Volkswagen Ag | Method and device for determining a corrective steering torque |
DE102008061649A1 (en) * | 2008-06-11 | 2009-12-17 | Volkswagen Ag | Driver assistance system and method for assisting a motor vehicle driver |
US8039552B2 (en) | 2008-07-04 | 2011-10-18 | Sumitomo Chemical Company, Limited | Process for producing propylene block copolymer |
DE102008033688B4 (en) * | 2008-07-17 | 2016-12-29 | Hans Fritz | A steering control apparatus for controlling the lateral movement of a vehicle and a method of operating such a steering controller |
DE102008040627A1 (en) * | 2008-07-23 | 2010-02-04 | Robert Bosch Gmbh | Method for regulating or controlling steering assistance system for vehicle, involves calculating convergence at peripheral object, where convergence is adapted depending on engaging free area or steering engagement |
DE102009007254A1 (en) * | 2009-02-03 | 2010-08-05 | Trw Automotive Gmbh | Method of controlling a lane keeping assistant and lane departure warning |
DE102009022054A1 (en) * | 2009-05-20 | 2010-11-25 | Audi Ag | Method for operating a driver assistance system for the transverse guidance of a motor vehicle and motor vehicle |
JP5510254B2 (en) * | 2010-10-01 | 2014-06-04 | トヨタ自動車株式会社 | Driving support apparatus and method |
EP2591983B1 (en) | 2011-11-11 | 2018-01-10 | Volvo Car Corporation | Method and system for adaptation of a steering wheel torque overlay of a lane keeping aid system |
DE102012013690B4 (en) * | 2012-07-07 | 2022-09-08 | Volkswagen Aktiengesellschaft | Method for adapting a supportive steering of a vehicle and driver assistance system |
JP5783204B2 (en) * | 2013-05-01 | 2015-09-24 | トヨタ自動車株式会社 | Driving support device and driving support method |
KR101491391B1 (en) * | 2013-12-30 | 2015-02-06 | 현대자동차주식회사 | Method for determining driving course deviation of vehicle |
EP3018040B1 (en) | 2014-11-04 | 2018-01-10 | Volvo Car Corporation | Method and system for intelligent scaling of torque overlay intervention for semi-autonomous road vehicle steering systems |
KR101655587B1 (en) * | 2014-12-01 | 2016-09-07 | 현대자동차주식회사 | Integrative method and system for controlling blind spot detection system and lane keeping assist system |
KR102053469B1 (en) * | 2014-12-08 | 2019-12-06 | 현대자동차주식회사 | Steering control method of vehicle |
JP6361567B2 (en) | 2015-04-27 | 2018-07-25 | トヨタ自動車株式会社 | Automated driving vehicle system |
JP6791616B2 (en) * | 2015-04-27 | 2020-11-25 | トヨタ自動車株式会社 | Self-driving vehicle system |
DE102015216152A1 (en) * | 2015-08-25 | 2017-03-02 | Conti Temic Microelectronic Gmbh | Lane keeping assistance system, motor vehicle with such a lane keeping assistance device and a method for lane keeping monitoring |
FR3043976B1 (en) * | 2015-11-19 | 2018-11-16 | Renault S.A.S. | METHOD FOR AIDING THE DRIVING OF A MOTOR VEHICLE |
JP6658235B2 (en) * | 2016-04-11 | 2020-03-04 | トヨタ自動車株式会社 | Lane keeping device |
JP6753199B2 (en) | 2016-08-02 | 2020-09-09 | いすゞ自動車株式会社 | Lane maintenance support device and lane maintenance support method |
JP7077819B2 (en) * | 2018-06-29 | 2022-05-31 | マツダ株式会社 | Vehicle control unit |
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- 2005-10-31 DE DE102005052034A patent/DE102005052034A1/en not_active Withdrawn
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- 2006-09-19 JP JP2008537024A patent/JP4741676B2/en active Active
- 2006-09-19 US US12/084,355 patent/US9211910B2/en active Active
- 2006-09-19 EP EP06793631A patent/EP1945494B1/en active Active
- 2006-09-19 WO PCT/EP2006/066495 patent/WO2007051671A1/en active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
DE102005052034A1 (en) | 2007-05-03 |
WO2007051671A1 (en) | 2007-05-10 |
DE502006004544D1 (en) | 2009-09-24 |
JP4741676B2 (en) | 2011-08-03 |
JP2009513428A (en) | 2009-04-02 |
EP1945494A1 (en) | 2008-07-23 |
US20100004821A1 (en) | 2010-01-07 |
EP1945494B1 (en) | 2009-08-12 |
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